Socket structure for electric incandescent lamps.



J. P. NAYLOR. SOCKET STRUCTURE FOR ELECTRIC INQAIIDESOBNT LAMPS.

APPLICATION FILED JANv10,1914.

110 9343 Patented M21118, 1914.

Wc'lneases. in Want t. lkjlb Jim PR/fiT/Y/ML Mylo z idiom/ y the circuit.

'n rnn TE T OFFICE.

JAMIE-s PRIESTNALL NAYLOR, OF LONDON, ENGLAND.

SOCKET STRUCTURE FOR ELECTRIC INCANDESCENT LAMPS.

Specification of Letters Patent. Application filed January 10, 1914.

Serial No. 811,386.

To all nr/wm it '12? m concern the circuit and the insertion of a lamp in an lie it known that I, Janns Pmnsrnann unoccupied position will separate the con- NArLon, a subject of the King of l lngland, l tacts and render inoperative the alternative residing at London, in England, have invented certain new and useful Improve- Il'lGlltS in Socket Structures tor Electric Incandescent Lamps, of which the following is a specification.

This invention ture for electric circuit so that the current must then flow through the lampfilamcnt in substitution of the alternative circuit.

The invention consists in the novel features, arrangements and combinations of parts hereinafter fully described andspcciiically pointed out in the appended claim, reference being directed to the accompanying drawings, in which Figure 1 is a section illustratingonc embodimont of the present mvention. Fig. 2 a section illustrating a modification with the use of a resistance in the suhstitutional circuit; and Figs. 3 and at are partial views of sockets shown in Figs. 1 and 2, with the lamps removed, showing closed circuits.

Figs. 1 and 8 illustrate part of a solid panel or other support G and lamp or element; inserted through an aperture N therein. A represents an electric incandescent lamp, B a tubular extension of or an addition to the lamp cap, connected with one end of the filament, C is a tubular section of insulating nniterial inserted in the tube B, and D is a smaller concentric concuit or insertion into the circuit of the pluductor passing" down the insulated tuhc C raiity otlanips is ell'ected direct; without the and connected to the opposite end of the intervention oil: any auxiliary means outside I lamp filament, such member having a c0nthe lamp socket structure on removal of the l ducting ball or enlargement I) attached to its lamp by the provision of a novel construeend. Attached to the rear of the support G tion of lamp contacts n such a manner that are two resilient contacts II and 1 ara'lter or during the withdrawal of any lamp ranged to engage respectively with the secmay be maintained, due to said tions B and E of the element, when the conta -ls being permitted to engage one an- I lamp base is passed through the aperture N, l l l l l relates to a socket struc incandescent lamps, more particularly for use in cases where a plu rality of said lamps are connected in series such. tor example in electric advertising or signaling; apparatus in which letters or LS are exhibited by a suitable arrangement of such a, plurality of lamps. I A plurality of electric lamps have been previously mounted such a manner that in series or parallel in on :lailure of, or removal olt, a lamp an alternative circuit; or substr tutional resistance is automatically produced. but with all constructions known to me it has been necessary to provide some auxiliary means, OlOtfllOnJflgllGilC or otherwise, for bringing the said alternative cir-- cnit or suhstitutioinil resistance intooperation. New according to the present invention this production of the altcrnative cirother, or to engage a third contact connectthe said contact-s being fed by electric con cd to a resistance, thus providing an alterductors P and Q, which are connected to native circuit. other similar contacts of further elements In the case of a monogrammic or similar upon the support so that the whole of the readvertisiugr a pmratu with a series of elccsilicnt contacts Il and I are connected in tric lamps in operation, the removal of one I electrical series. Now when the portion B of said lamps trout the circuit would cause D E, of the element is inserted as shown, the remainder oi the series to be eXt-inthe contact H is lifted so that it ceases to gyguished and without the short. circuiting engage the contact I and the lamp filament means referred to above it would not be posis then substituted for the alternative path sible to arrange and roan-saline a. number of or circuit H I ltlll'lPS upon a n'ionogram to form a letter or In the construction shown in Figs; 2 and se pzenceof dis imilarlettersrequiringvaryat. I provide the lamp receiving socket G ing mnuluxrs oi elements or lamps, since with an additional contact H and each is when a letter i formed upon a monogram, I provided with a resistance R, equivalent to there are always some positions or sockets I the resistance of the lamp element, and connnoccupied so that without the substitul .ncctcd therewith as by the conductors litor circuit these positions would so that the removal or replacement of a lamp tional path constitute a discontmulty or interruption of forming one of a series does not affect the r n v H the socket u.

resistance of the circuit. H the conductors Y are connected with a source of electricity and an element is inserted in the face of the monog am or socket, current will flow through the conductor X to the contact thence to the element contact tube B irough the filament of lamp A to the point then through resilient contact I to the opposite pole of a source of electricity. When the element is removed the contact I engages the additional contact tongue H so that it the conductors X Y remained connected to the source of electricity, current now flow through the conductor X to in the conductor B through the resistance R to the contact tongue H which engages contact 1 and thence to conductor Y, so that the re sistance R is automatically cut into circuit as shown in Fig. 4. When said lamp is inserted in the contacts the circuit to the resistance R is opened so that current then has path through the lamp filament, as

1 a T. L

described. it; will be seen that it the whole of the element retaining positions are con-- nected in series, series-parallel or in parallel, and constructed in this manner, any number of elements containing electric lamps may be inserted in the provided holders or withdrawn therefrom Without materially ailecting the current flowing in the said series of parallel circuits. It is desirable that the contacts H H, I, should be so constructed that the current has an alternative path through the electric lamp filament before it opens the contact H thus preventing;- injurious sparking occurring at this point, as might be the case in series working; Fig. 2 also illustrates the construction adopted when the background is i not continuous but is p iormed for example, ot open \vn-ework, or a A network composed by Qcllcction oi links. The body G formin' the socket has the lugs G for attachn it of the wires whereby it is connected to other sockets in. proper relative location. G is a threaded for closing the back of is p is shown having a tlllfit'l to its cap, such circular plate being preferably of dissimilar color or material to the front of the sup port so as to form the daylight; member, and the said lamp plate, lamp cap, and concentric connection members collectively form the element. A domed cover or globe F of transparent or translucent material is also shown as connected to the plate F and covering the lamp A.

lVhat I claim as my invention and desire to secure by Letters Patent ot the United States is 1. In a socket structure for incandescent lamps, the combination of a pair of lampengaging contacts, a third contact arranged to engage one of said lamp-engaging contacts when a lamp is absent and to be disengaged therefrom on insertion oi a lamp, and an electrical connection between said third contact and the other lamp-engaging contact.

2. In a socket structure for incandescent lamps, the combination of a pair of lamp cngagin contacts, a third contact arranged to engage one of said lan'urengaging contacts when a lamp is absent and to be dis engaged therefrom on insertion oi a and a resistance between said third contact and the other lamp-engaging contact, said resistance substantially equal to the resistance of a lamp filament normally inserted insaid socket.

3. in a socket structure for incandescent lamps, the combination of a pair of lampengaging contacts, a circuit connection botnecn the contacts including a resistance equal to that of a lamp, and circuit-closing means in said circuit connection operable by the lamp to open the circuit by insertion of the lamp and closing the saniie when the lamp is removed.

n1 witness whereof I have signed this specification in the presence of two witsee.

, JAMES PRIESTNALL UACKLOR. l'V itHOSSCS H. D. Jameson,

W. E. Bosses.

lamp, 

